Northstar Engines and System Technical Discussion Discussion, High Mileage Northstar Thread: Who can beat me? in Cadillac Engine Discussion; Originally Posted by 04GrandAmGT
My 01 DTS has ~240,000 original Miles as far as i know (not studed because gaskets ...

Re: High Mileage Northstar Thread: Who can beat me?

182K on my '97 STS.
Up to 6 months ago it was all untouched power train, since the engine was pulled 3 times and the transmission was replaced twice.
It all started with a winding noise when shifting until eventually it was slipping and winding all the time.
Finally the 3-rd time when the engine was removed the transmission was replaced with a new GM unit and hope for the best.
Ah...and since I did not wanted to go again trough another engine removal I decided to stud the engine for absolutely no reason, it was holding just fine but is safer now. The bottom end was resealed and the timing chains and tensioners replaced (one of the tensioners was worn all the way to the metal). That's about the only thing worth to be mentioned with the condition of the engine.
Engine awesome, transmission pretty disappointed as it lasted only 175K and it was really well taken care of (I mean REALLY well, never ever abused, fluid/filters changed 3 times).

Re: High Mileage Northstar Thread: Who can beat me?

Originally Posted by drivendeville

Give it what it wants! My Deville still likes WOT at 610,000.

Holy Moly, Are all those original miles? If so, that's the highest I've heard of anywhere on the planet! Any tips? Certain oil interval or brand? And do you really believe in the old proverbial saying, "A red line a day keeps the repair aways!" I'd really like to know what are the major stuff you needed to repair or replace.